U.S. patent application number 16/020400 was filed with the patent office on 2019-01-24 for waveform design based on power spectral density (psd) parameters.
The applicant listed for this patent is QUALCOMM Incorporated. Invention is credited to Tamer Kadous, Jing Sun, Xiaoxia Zhang.
Application Number | 20190029019 16/020400 |
Document ID | / |
Family ID | 65016025 |
Filed Date | 2019-01-24 |
United States Patent
Application |
20190029019 |
Kind Code |
A1 |
Zhang; Xiaoxia ; et
al. |
January 24, 2019 |
WAVEFORM DESIGN BASED ON POWER SPECTRAL DENSITY (PSD)
PARAMETERS
Abstract
Wireless communications systems and methods related to
communicating in a frequency spectrum using interlaced frequency
channels and non-interlaced frequency channels are provided. A
first wireless communication device selects a waveform structure
between an interlaced frequency structure and a non-interlaced
frequency structure for communicating in a frequency spectrum. The
first wireless communication device communicates, with a second
wireless communication device in the frequency spectrum, a
communication signal based on the selected waveform structure. The
interlaced frequency structure includes at least a first set of
frequency bands in the frequency spectrum, the first set of
frequency bands interlacing with a second set of frequency bands in
the frequency spectrum. The non-interlaced frequency structure
includes one or more contiguous frequency bands in the frequency
spectrum.
Inventors: |
Zhang; Xiaoxia; (San Diego,
CA) ; Sun; Jing; (San Diego, CA) ; Kadous;
Tamer; (San Diego, CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
QUALCOMM Incorporated |
San Diego |
CA |
US |
|
|
Family ID: |
65016025 |
Appl. No.: |
16/020400 |
Filed: |
June 27, 2018 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
62535098 |
Jul 20, 2017 |
|
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|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04L 5/0007 20130101;
H04W 56/0045 20130101; H04L 5/0066 20130101; H04L 27/2614 20130101;
H04W 74/0833 20130101; H04L 5/0042 20130101; H04L 5/0092 20130101;
H04W 16/14 20130101; H04W 52/50 20130101; H04W 52/365 20130101;
H04L 5/0053 20130101; H04L 27/2602 20130101; H04W 72/0453 20130101;
H04L 5/0037 20130101; H04W 52/16 20130101 |
International
Class: |
H04W 72/04 20060101
H04W072/04; H04W 74/08 20060101 H04W074/08 |
Claims
1. A method of wireless communication, comprising: selecting, by a
first wireless communication device, a waveform structure between
an interlaced frequency structure and a non-interlaced frequency
structure for communicating in a frequency spectrum; and
communicating, by the first wireless communication device with a
second wireless communication device in the frequency spectrum, a
communication signal based on the selected waveform structure.
2. The method of claim 1, wherein the interlaced frequency
structure includes at least a first set of frequency bands in the
frequency spectrum, the first set of frequency bands interlacing
with a second set of frequency bands in the frequency spectrum, and
wherein the non-interlaced frequency structure includes one or more
contiguous frequency bands in the frequency spectrum.
3. The method of claim 1, wherein the selecting is based on a power
spectral density (PSD) parameter of the frequency spectrum.
4. The method of claim 3, wherein the PSD parameter is associated
with a PSD requirement in the frequency spectrum, and wherein the
selecting includes: determining whether the frequency spectrum has
the PSD requirement; and selecting the interlaced frequency
structure as the waveform structure when determining that the
frequency spectrum has the PSD requirement.
5. The method of claim 3, wherein the PSD parameter is associated
with a PSD requirement in the frequency spectrum, wherein the
selecting is based on a first frequency band having the PSD
requirement and a second frequency band not having the PSD
requirement, and wherein the communicating includes: communicating
a first communication signal with the interlaced frequency
structure in the first frequency band; and communicating a second
communication signal with the non-interlaced frequency structure in
the second frequency band.
6. The method of claim 1, further comprising transmitting, by the
first wireless communication device, a configuration indicating the
waveform structure for communicating in the frequency spectrum.
7. The method of claim 6, wherein the selecting is based on a power
headroom of the second wireless communication device.
8. The method of claim 1, further comprising receiving, by the
first wireless communication device from the second wireless
communication device, a configuration indicating the waveform
structure for communicating in the frequency spectrum, wherein the
selecting is based on the configuration.
9. The method of claim 1, further comprising: communicating, by the
first wireless communication device with the second wireless
communication device, a configuration indicating a first set of
random access resources having a interlaced frequency structure and
a second set of random access resources having a non-interlaced
frequency structure; and communicating, by the first wireless
communication device with the second wireless communication device,
a random access signal based on the configuration.
10. The method of claim 9, wherein the first set of random access
resources and the second set of random access resources are in
different frequency bands within the frequency spectrum.
11. The method of claim 9, wherein the first set of random access
resources and the second set of random access resources are in
different time periods.
12. The method of claim 9, wherein the communicating the
configuration includes transmitting, by the first wireless
communication device to the second wireless communication device,
the configuration, and wherein the communicating the random access
signal includes monitoring, by the first wireless communication
device, for the random access signal.
13. The method of claim 9, wherein the communicating the
configuration includes receiving, by the first wireless
communication device from the second wireless communication device,
the configuration.
14. The method of claim 13, further comprising: determining, by the
first wireless communication device, whether to transmit the random
access signal to the second wireless communication device using the
first set of random access resources or the second set of random
access resources based on at least one of the configuration, a
power headroom of the second wireless communication device, or a
power utilization factor of the second wireless communication
device.
15. The method of claim 13, wherein the communicating the random
access signal includes: transmitting, by the first wireless
communication device to the second wireless communication device
using the second set of random access resources, a first random
access signal with the non-interlaced frequency structure at a
first transmit power; and transmitting, by the first wireless
communication device to the second wireless communication device
using the first set of random access resources, a second random
access signal with the interlaced frequency structure at a second
transmit power greater than the first transmit power.
16. The method of claim 15, further comprising determining, by the
first wireless communication device, to transmit the second random
access signal with the interlaced frequency structure using the
first set of random access resources based on a comparison between
the second transmit power and a power spectral density (PSD)
parameter of a frequency band of the second set of random access
resources.
17. The method of claim 1, wherein the frequency spectrum includes
a first subcarrier spacing for the non-interlaced frequency
structure, wherein the communicating the communication signal
includes communicating the communication signal using a second
subcarrier spacing for the interlaced frequency structure, and
wherein the first subcarrier spacing is greater than the second
subcarrier spacing.
18. An apparatus comprising: a processor configured to select a
waveform structure between an interlaced frequency structure and a
non-interlaced frequency structure for communicating in a frequency
spectrum; and a transceiver configured to communicate, with a
second wireless communication device in the frequency spectrum, a
communication signal based on the selected waveform structure.
19. The apparatus of claim 18, wherein the interlaced frequency
structure includes at least a first set of frequency bands in the
frequency spectrum, the first set of frequency bands interlacing
with a second set of frequency bands in the frequency spectrum, and
wherein the non-interlaced frequency structure includes one or more
contiguous frequency bands in the frequency spectrum.
20. The apparatus of claim 18, wherein the processor is further
configured to select the waveform structure based on a power
spectral density (PSD) parameter of the frequency spectrum.
21. The apparatus of claim 20, wherein the PSD parameter is
associated with a PSD requirement in the frequency spectrum, and
wherein the processor is further configured to select the waveform
structure by: determining whether the frequency spectrum has a PSD
requirement; and selecting the interlaced frequency structure as
the waveform structure when determining that the frequency spectrum
has the PSD requirement.
22. The apparatus of claim 20, wherein the PSD parameter is
associated with a PSD requirement in the frequency spectrum,
wherein the processor is further configured to select the waveform
structure based on a first frequency band having the PSD
requirement and a second frequency band not having the PSD
requirement, and wherein the transceiver is further configured to:
communicate a first communication signal with the interlaced
frequency structure in the first frequency band; and communicate a
second communication signal with the non-interlaced frequency
structure in the second frequency band.
23. The apparatus of claim 18, wherein the transceiver is further
configured to transmit a configuration indicating the waveform
structure for communicating in the frequency spectrum.
24. The apparatus of claim 23, wherein the processor is further
configured to select the waveform structure based on a power
headroom of the second wireless communication device.
25. The apparatus of claim 18, wherein the transceiver is further
configured to receive, from the second wireless communication
device, a configuration indicating the waveform structure for
communicating in the frequency spectrum, and wherein the processor
is further configured to select the waveform structure based on the
configuration.
26. The apparatus of claim 18, wherein the transceiver is further
configured to: communicate, with the second wireless communication
device, a configuration indicating a first set of random access
resources having an interlaced frequency structure and a second set
of random access resources having a non-interlaced frequency
structure; and communicate, with the second wireless communication
device, a random access signal based on the configuration.
27. The apparatus of claim 26, wherein the first set of random
access resources and the second set of random access resources are
in different frequency bands within the frequency spectrum.
28. The apparatus of claim 26, wherein the first set of random
access resources and the second set of random access resources are
in different time periods.
29. The apparatus of claim 26, wherein the transceiver is further
configured to: communicate the configuration by transmitting, to
the second wireless communication device, the configuration; and
communicate the random access signal by monitoring for the random
access signal.
30. The apparatus of claim 26, wherein the transceiver is further
configured to communicate the configuration by receiving, from the
second wireless communication device, the configuration.
31. The apparatus of claim 30, wherein the processor is further
configured to determine whether to transmit the random access
signal to the second wireless communication device using the first
set of random access resources or the second set of random access
resources based on at least one of the configuration, a power
headroom of the second wireless communication device, or a power
utilization factor of the second wireless communication device.
32. The apparatus of claim 30, wherein the transceiver is further
configured to communicate the random access signal by:
transmitting, to the second wireless communication device using the
second set of random access resources, a first random access signal
with the non-interlaced frequency structure at a first transmit
power; and transmitting, to the second wireless communication
device using the first set of random access resources, a second
random access signal with the interlaced frequency structure at a
second transmit power greater than the first transmit power.
33. The apparatus of claim 32, wherein the processor is further
configured to determine to transmit the second random access signal
with the interlaced frequency structure using the first set of
random access resources based on a comparison between the second
transmit power and a power spectral density (PSD) parameter of a
frequency band of the second set of random access resources.
34. The apparatus of claim 18, wherein the frequency spectrum
includes a first SCS for the non-interlaced frequency structure,
wherein the transceiver is further configured to communicate the
communication signal by communicating the communication signal
using a second SCS for the interlaced frequency structure, and
wherein the first SCS is greater than the second SCS.
35. A computer-readable medium having program code recorded
thereon, the program code comprising: code for causing a first
wireless communication device to select a waveform structure
between an interlaced frequency structure and a non-interlaced
frequency structure for communicating in a frequency spectrum; and
code for causing the first wireless communication device to
communicate, with a second wireless communication device in the
frequency spectrum, a communication signal based on the selected
waveform structure.
36. The computer-readable medium of claim 35, wherein the
interlaced frequency structure includes at least a first set of
frequency bands in the frequency spectrum, the first set of
frequency bands interlacing with a second set of frequency bands in
the frequency spectrum, and wherein the non-interlaced frequency
structure includes one or more contiguous frequency bands in the
frequency spectrum.
37. The computer-readable medium of claim 35, wherein the code for
causing the first wireless communication device to select the
waveform structure is further configured to select the waveform
structure based on a power spectral density (PSD) parameter of the
frequency spectrum.
38. The computer-readable medium of claim 37, wherein the PSD
parameter is associated with a PSD requirement in the frequency
spectrum, and wherein the code for causing the first wireless
communication device to select the waveform structure is further
configured to select the waveform structure by: determining whether
the frequency spectrum has the PSD requirement; and selecting the
interlaced frequency structure as the waveform structure when
determining that the frequency spectrum has the PSD
requirement.
39. The computer-readable medium of claim 37, wherein the PSD
parameter is associated with a PSD requirement in the frequency
spectrum, wherein the code for causing the first wireless
communication device to select the waveform structure is further
configured to select the waveform structure based on a first
frequency band having the PSD requirement and a second frequency
band not having the PSD requirement, and wherein the code for
causing the first wireless communication device to communicate the
communication signal is further configured to communicate the
communicate signal by: communicating a first communication signal
with the interlaced frequency structure in the first frequency
band; and communicating a second communication signal with the
non-interlaced frequency structure in the second frequency
band.
40. The computer-readable medium of claim 35, further comprising
code for causing the first wireless communication device to
transmit a configuration indicating the waveform structure for
communicating in the frequency spectrum.
41. The computer-readable medium of claim 40, wherein the code for
causing the first wireless communication device to select the
waveform structure is further configured to select the waveform
structure based on a power headroom of the second wireless
communication device.
42. The computer-readable medium of claim 35, further comprising
code for causing the first wireless communication device to
receive, from the second wireless communication device, a
configuration indicating the waveform structure for communicating
in the frequency spectrum, wherein the code for causing the first
wireless communication device to select the waveform structure is
further configured to select the waveform structure based on the
configuration.
43. The computer-readable medium of claim 35, further comprising:
code for causing the first wireless communication device to
communicate, with the second wireless communication device, a
configuration indicating a first set of random access resources
having an interlaced frequency structure and a second set of random
access resources having a non-interlaced frequency structure; and
code for causing the first wireless communication device to
communicate, with the second wireless communication device, a
random access signal based on the configuration.
44. The computer-readable medium of claim 43, wherein the first set
of random access resources and the second set of random access
resources are in different frequency bands within the frequency
spectrum.
45. The computer-readable medium of claim 43, wherein the first set
of random access resources and the second set of random access
resources are in different time periods.
46. The computer-readable medium of claim 43, wherein the code for
causing the first wireless communication device to communicate the
configuration is further configured to transmit, to the second
wireless communication device, the configuration, and wherein the
code for causing the first wireless communication device to
communicate the random access signal is further configured to
monitor for the random access signal.
47. The computer-readable medium of claim 43, wherein the code for
causing the first wireless communication device to communicate the
configuration is further configured to receive, from the second
wireless communication device, the configuration.
48. The computer-readable medium of claim 47, further comprising:
code for causing the first wireless communication device to
determine whether to transmit the random access signal to the
second wireless communication device using the first set of random
access resources or the second set of random access resources based
on at least one of the configuration, a power headroom of the
second wireless communication device, or a power utilization factor
of the second wireless communication device.
49. The computer-readable medium of claim 47, wherein the code for
causing the first wireless communication device to communicate the
random access signal is further configured to: transmit, to the
second wireless communication device using the second set of random
access resources, a first random access signal with the
non-interlaced frequency structure at a first transmit power; and
transmit, to the second wireless communication device using the
first set of random access resources, a second random access signal
with the interlaced frequency structure at a second transmit power
greater than the first transmit power.
50. The computer-readable medium of claim 49, further comprising
code for causing the first wireless communication device to
determine to transmit the second random access signal with the
interlaced frequency structure using the first set of random access
resources based on a comparison between the second transmit power
and a power spectral density (PSD) parameter of a frequency band of
the second set of random access resources.
51. The computer-readable medium of claim 35, wherein the frequency
spectrum includes a first SCS for the non-interlaced frequency
structure, wherein the code for causing the first wireless
communication device to communicate the communication signal is
further configured to communicate the communication signal using a
second SCS for the interlaced frequency structure, and wherein the
first SCS is greater than the second SCS.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] The present application claims priority to and the benefit
of the U.S. Provisional Patent Application No. 62/535,098, filed
Jul. 20, 2017, which is hereby incorporated by reference in its
entirety as if fully set forth below and for all applicable
purposes.
TECHNICAL FIELD
[0002] This application relates to wireless communication systems
and methods, and more particularly to communicating in a frequency
spectrum using interlaced frequency channels and non-interlaced
frequency channels based on power spectral density (PSD)
parameters.
INTRODUCTION
[0003] Wireless communications systems are widely deployed to
provide various types of communication content such as voice,
video, packet data, messaging, broadcast, and so on. These systems
may be capable of supporting communication with multiple users by
sharing the available system resources (e.g., time, frequency, and
power). A wireless multiple-access communications system may
include a number of base stations (BSs), each simultaneously
supporting communication for multiple communication devices, which
may be otherwise known as user equipment (UE).
[0004] To meet the growing demands for expanded mobile broadband
connectivity, wireless communication technologies are advancing
from the LTE technology to a next generation new radio (NR)
technology. NR may provision for dynamic medium sharing among
network operators in a licensed spectrum, a shared spectrum, and/or
an unlicensed spectrum. For example, shared spectrums and/or
unlicensed spectrums may include frequency bands at about 3.5
gigahertz (GHz), about 6 GHz, and about 60 GHz.
[0005] Some shared spectrums and/or unlicensed spectrums may have
certain PSD requirements. For example, the European
Telecommunications Standard Institute (ETSI) document EN 301 893
V2.1.1 specifies various PSD limits for sub-6 GHz frequency bands
and the ETSI draft document EN 302 567 V2.0.22 specifies a maximum
equivalent isotropic radiated power (EIRP) and an EIRP density for
60 GHz frequency bands. Some other frequency bands, such as
citizens broadband radio service (CBRS) bands at about 3.5 GHz, may
not restrict transmissions to a particular PSD limit. In general,
different spectrums may have different PSD requirements and/or
different bandwidth occupancy requirements. Thus, during spectrum
sharing, transmissions in such shared spectrums and/or unlicensed
spectrums are required to meet PSD requirements and/or frequency
occupancy requirements of corresponding spectrums.
BRIEF SUMMARY OF SOME EXAMPLES
[0006] The following summarizes some aspects of the present
disclosure to provide a basic understanding of the discussed
technology. This summary is not an extensive overview of all
contemplated features of the disclosure, and is intended neither to
identify key or critical elements of all aspects of the disclosure
nor to delineate the scope of any or all aspects of the disclosure.
Its sole purpose is to present some concepts of one or more aspects
of the disclosure in summary form as a prelude to the more detailed
description that is presented later.
[0007] For example, in an aspect of the disclosure, a method of
wireless communication including selecting, by a first wireless
communication device, a waveform structure between an interlaced
frequency structure and a non-interlaced frequency structure for
communicating in a frequency spectrum; and communicating, by the
first wireless communication device with a second wireless
communication device in the frequency spectrum, a communication
signal based on the selected waveform structure.
[0008] In an additional aspect of the disclosure, an apparatus
including a processor configured to select a waveform structure
between an interlaced frequency structure and a non-interlaced
frequency structure for communicating in a frequency spectrum; and
a transceiver configured to communicate, with a second wireless
communication device in the frequency spectrum, a communication
signal based on the selected waveform structure.
[0009] In an additional aspect of the disclosure, a
computer-readable medium having program code recorded thereon, the
program code including code for causing a first wireless
communication device to select a waveform structure between an
interlaced frequency structure and a non-interlaced frequency
structure for communicating in a frequency spectrum; and code for
causing the first wireless communication device to communicate,
with a second wireless communication device in the frequency
spectrum, a communication signal based on the selected waveform
structure.
[0010] Other aspects, features, and embodiments of the present
invention will become apparent to those of ordinary skill in the
art, upon reviewing the following description of specific,
exemplary embodiments of the present invention in conjunction with
the accompanying figures. While features of the present invention
may be discussed relative to certain embodiments and figures below,
all embodiments of the present invention can include one or more of
the advantageous features discussed herein. In other words, while
one or more embodiments may be discussed as having certain
advantageous features, one or more of such features may also be
used in accordance with the various embodiments of the invention
discussed herein. In similar fashion, while exemplary embodiments
may be discussed below as device, system, or method embodiments it
should be understood that such exemplary embodiments can be
implemented in various devices, systems, and methods.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1 illustrates a wireless communication network
according to embodiments of the present disclosure.
[0012] FIG. 2 is a block diagram of an exemplary user equipment
(UE) according to embodiments of the present disclosure.
[0013] FIG. 3 is a block diagram of an exemplary base station (BS)
according to embodiments of the present disclosure.
[0014] FIG. 4 illustrates a frequency interlacing scheme according
to embodiments of the present disclosure.
[0015] FIG. 5 illustrates a frequency interlacing scheme according
to embodiments of the present disclosure.
[0016] FIG. 6 illustrates a band-dependent waveform selection
scheme according to embodiments of the present disclosure.
[0017] FIG. 7 is a signaling diagram of a network-specific waveform
selection method according to embodiments of the present
disclosure.
[0018] FIG. 8 is a signaling diagram of a UE-specific waveform
selection method according to embodiments of the present
disclosure.
[0019] FIG. 9 illustrates a random access transmission scheme
according to embodiments of the present disclosure.
[0020] FIG. 10 illustrates a random access transmission scheme
according to embodiments of the present disclosure.
[0021] FIG. 11 illustrates a frequency interlacing scheme with a
reduced subcarrier spacing (SCS) according to embodiments of the
present disclosure.
[0022] FIG. 12 is a flow diagram of a communication method with a
waveform selection according to embodiments of the present
disclosure.
DETAILED DESCRIPTION
[0023] The detailed description set forth below, in connection with
the appended drawings, is intended as a description of various
configurations and is not intended to represent the only
configurations in which the concepts described herein may be
practiced. The detailed description includes specific details for
the purpose of providing a thorough understanding of the various
concepts. However, it will be apparent to those skilled in the art
that these concepts may be practiced without these specific
details. In some instances, well-known structures and components
are shown in block diagram form in order to avoid obscuring such
concepts.
[0024] The techniques described herein may be used for various
wireless communication networks such as code-division multiple
access (CDMA), time-division multiple access (TDMA),
frequency-division multiple access (FDMA), orthogonal
frequency-division multiple access (OFDMA), single-carrier FDMA
(SC-FDMA) and other networks. The terms "network" and "system" are
often used interchangeably. A CDMA network may implement a radio
technology such as Universal Terrestrial Radio Access (UTRA),
cdma2000, etc. UTRA includes Wideband CDMA (WCDMA) and other
variants of CDMA. cdma2000 covers IS-2000, IS-95 and IS-856
standards. A TDMA network may implement a radio technology such as
Global System for Mobile Communications (GSM). An OFDMA network may
implement a radio technology such as Evolved UTRA (E-UTRA), Ultra
Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX),
IEEE 802.20, Flash-OFDMA, etc. UTRA and E-UTRA are part of
Universal Mobile Telecommunication System (UMTS). 3GPP Long Term
Evolution (LTE) and LTE-Advanced (LTE-A) are new releases of UMTS
that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are
described in documents from an organization named "3rd Generation
Partnership Project" (3GPP). CDMA2000 and UMB are described in
documents from an organization named "3rd Generation Partnership
Project 2" (3GPP2). The techniques described herein may be used for
the wireless networks and radio technologies mentioned above as
well as other wireless networks and radio technologies, such as a
next generation (e.g., 5.sup.th Generation (5G) operating in mmWave
bands) network.
[0025] The present application describes mechanisms for
communicating in a frequency spectrum using interlaced frequency
structure and non-interlaced frequency structure based on power
spectral density (PSD) parameters. The PSD parameters may be
associated with a maximum PSD level or a range of PSD levels
allowable in the frequency spectrum, a target transmit PSD level,
and/or a power utilization factor of a transmitter. An interlaced
frequency structure may include multiple sets of interlacing
frequency bands. For example, a transmission signal may be
transmitted in a set of frequency bands spaced apart from each
other and interlaced with another set of frequency bands. The
distribution of a transmit signal in a frequency domain can reduce
the transmit PSD of the signal. For example, a frequency occupancy
distribution factor of about 5 may allow a transmitter to increase
the transmit power by about 7 decibels (dB) while maintaining the
same PSD level. Thus, the distribution in the frequency domain can
improve power utilization. The disclosed embodiments may further
improve power utilization by employing time domain repetitions
(e.g., increasing a transmission duration) in conjunction with
frequency interlacing. The disclosed embodiments may further
improve power utilization by reducing a SCS in conjunction with
frequency interlacing to allow for a greater frequency
distribution.
[0026] In an embodiment, the selection between an interlaced
frequency structure and a non-interlaced frequency structure may be
band-dependent. For example, a BS or a UE may select an interlaced
frequency structure when communicating in a frequency band with a
PSD requirement. Alternatively, a BS or a UE may select a
non-interlaced frequency structure when communicating in a
frequency band without a PSD requirement. The BS and the UE may
have prior knowledge of the PSD requirements in various frequency
bands prior to communicating in the frequency bands.
[0027] In an embodiment, the selection between an interlaced
frequency structure and a non-interlaced frequency structure may be
network-specific. For example, a BS may signal an interlaced
frequency structure for a frequency band with a PSD requirement.
Alternatively, a BS may signal a non-interlaced frequency structure
for a frequency band without a PSD requirement. The signaling may
be a broadcast signal to all UEs in a network.
[0028] In an embodiment, the selection between an interlaced
frequency structure and a non-interlaced frequency structure may be
UE-specific. For example, a BS may configure a power-limited UE
with an interlaced frequency structure and configure a
non-power-limited UE with a non-interlaced frequency structure. The
configuration may be carried in a radio resource configuration
(RRC) message.
[0029] In an embodiment, a BS may configure some random access
resources with an interlaced frequency structure and some other
random access resources with a non-interlaced frequency structure.
A UE may choose to send a random access channel (RACH) preamble
with the interlaced or non-interlaced random access resources based
on a downlink pathloss measurement. In addition, the UE may perform
power ramping in a random access procedure between the interlaced
and non-interlaced RACH resources. For example, the UE may begin
with transmitting a random access signal using a non-interlaced
frequency resource with an initial transmit power. The UE may
increase the transmit power for subsequent random access signal
transmissions. The UE may switch to use an interlaced frequency
resource when the transmit power is increased to a level exceeding
a maximum PSD level allowable in a frequency band of the
non-interlaced frequency resources.
[0030] Aspects of the present application can provide several
benefits. For example, the use of frequency interlacing may improve
power utilization at a transmitter. The band-dependent,
network-specific, and/or UE-specific selections allow dynamic
multiplexing of interlaced frequency channels and non-interlaced
frequency channels based on PSD requirements and UEs' power
utilization factors. The use of TTI bundling and/or reduced SCS
provides flexibility in scheduling with power utilization
consideration. The disclosed embodiments may be suitable for use in
any wireless communication network with any wireless communication
protocol.
[0031] FIG. 1 illustrates a wireless communication network 100
according to embodiments of the present disclosure. The network 100
includes BSs 105, UEs 115, and a core network 130. In some
embodiments, the network 100 operates over a shared spectrum. The
shared spectrum may be unlicensed or partially licensed to one or
more network operators. Access to the spectrum may be limited and
may be controlled by a separate coordination entity. In some
embodiments, the network 100 may be a LTE or LTE-A network. In yet
other embodiments, the network 100 may be a millimeter wave (mmW)
network, a new radio (NR) network, a 5G network, or any other
successor network to LTE. The network 100 may be operated by more
than one network operator. Wireless resources may be partitioned
and arbitrated among the different network operators for
coordinated communication between the network operators over the
network 100.
[0032] The BSs 105 may wirelessly communicate with the UEs 115 via
one or more BS antennas. Each BS 105 may provide communication
coverage for a respective geographic coverage area 110. In 3GPP,
the term "cell" can refer to this particular geographic coverage
area of a BS and/or a BS subsystem serving the coverage area,
depending on the context in which the term is used. In this regard,
a BS 105 may provide communication coverage for a macro cell, a
pico cell, a femto cell, and/or other types of cell. A macro cell
generally covers a relatively large geographic area (e.g., several
kilometers in radius) and may allow unrestricted access by UEs with
service subscriptions with the network provider. A pico cell may
generally cover a relatively smaller geographic area and may allow
unrestricted access by UEs with service subscriptions with the
network provider. A femto cell may also generally cover a
relatively small geographic area (e.g., a home) and, in addition to
unrestricted access, may also provide restricted access by UEs
having an association with the femto cell (e.g., UEs in a closed
subscriber group (CSG), UEs for users in the home, and the like). A
BS for a macro cell may be referred to as a macro BS. A BS for a
pico cell may be referred to as a pico BS. A BS for a femto cell
may be referred to as a femto BS or a home BS. In the example shown
in FIG. 1, the BSs 105a, 105b and 105c are examples of macro BSs
for the coverage areas 110a, 110b and 110c, respectively. The BSs
105d is an example of a pico BS or a femto BS for the coverage area
110d. As will be recognized, a BS 105 may support one or multiple
(e.g., two, three, four, and the like) cells.
[0033] Communication links 125 shown in the network 100 may include
uplink (UL) transmissions from a UE 115 to a BS 105, or downlink
(DL) transmissions, from a BS 105 to a UE 115. The UEs 115 may be
dispersed throughout the network 100, and each UE 115 may be
stationary or mobile. A UE 115 may also be referred to as a mobile
station, a subscriber station, a mobile unit, a subscriber unit, a
wireless unit, a remote unit, a mobile device, a wireless device, a
wireless communications device, a remote device, a mobile
subscriber station, an access terminal, a mobile terminal, a
wireless terminal, a remote terminal, a handset, a user agent, a
mobile client, a client, or some other suitable terminology. A UE
115 may also be a cellular phone, a personal digital assistant
(PDA), a wireless modem, a wireless communication device, a
handheld device, a tablet computer, a laptop computer, a cordless
phone, a personal electronic device, a handheld device, a personal
computer, a wireless local loop (WLL) station, an Internet of
things (IoT) device, an Internet of Everything (IoE) device, a
machine type communication (MTC) device, an appliance, an
automobile, or the like.
[0034] The BSs 105 may communicate with the core network 130 and
with one another. The core network 130 may provide user
authentication, access authorization, tracking, Internet Protocol
(IP) connectivity, and other access, routing, or mobility
functions. At least some of the BSs 105 (e.g., which may be an
example of an evolved NodeB (eNB), a next generation NodeB (gNB),
or an access node controller (ANC)) may interface with the core
network 130 through backhaul links 132 (e.g., S1, S2, etc.) and may
perform radio configuration and scheduling for communication with
the UEs 115. In various examples, the BSs 105 may communicate,
either directly or indirectly (e.g., through core network 130),
with each other over backhaul links 134 (e.g., X1, X2, etc.), which
may be wired or wireless communication links.
[0035] Each BS 105 may also communicate with a number of UEs 115
through a number of other BSs 105, where the BS 105 may be an
example of a smart radio head. In alternative configurations,
various functions of each BS 105 may be distributed across various
BSs 105 (e.g., radio heads and access network controllers) or
consolidated into a single BS 105.
[0036] In some implementations, the network 100 utilizes orthogonal
frequency division multiplexing (OFDM) on the downlink and
single-carrier frequency division multiplexing (SC-FDM) on the UL.
OFDM and SC-FDM partition the system bandwidth into multiple (K)
orthogonal subcarriers, which are also commonly referred to as
tones, bins, or the like. Each subcarrier may be modulated with
data. In general, modulation symbols are sent in the frequency
domain with OFDM and in the time domain with SC-FDM. The spacing
between adjacent subcarriers may be fixed, and the total number of
subcarriers (K) may be dependent on the system bandwidth. The
system bandwidth may also be partitioned into subbands.
[0037] In an embodiment, the BSs 105 can assign or schedule
transmission resources (e.g., in the form of time-frequency
resource blocks) for DL and UL transmissions in the network 100. DL
refers to the transmission direction from a BS 105 to a UE 115,
whereas UL refers to the transmission direction from a UE 115 to a
BS 105. The communication can be in the form of radio frames. A
radio frame may be divided into a plurality of subframes, for
example, about 10. Each subframe can be divided into slots, for
example, about 2. Each slot may be further divided into mini-slots.
In a frequency-division duplexing (FDD) mode, simultaneous UL and
DL transmissions may occur in different frequency bands. For
example, each subframe includes a UL subframe in a UL frequency
band and a DL subframe in a DL frequency band. In a time-division
duplexing (TDD) mode, UL and DL transmissions occur at different
time periods using the same frequency band. For example, a subset
of the subframes (e.g., DL subframes) in a radio frame may be used
for DL transmissions and another subset of the subframes (e.g., UL
subframes) in the radio frame may be used for UL transmissions.
[0038] The DL subframes and the UL subframes can be further divided
into several regions. For example, each DL or UL subframe may have
pre-defined regions for transmissions of reference signals, control
information, and data. Reference signals are predetermined signals
that facilitate the communications between the BSs 105 and the UEs
115. For example, a reference signal can have a particular pilot
pattern or structure, where pilot tones may span across an
operational bandwidth or frequency band, each positioned at a
pre-defined time and a pre-defined frequency. For example, a BS 105
may transmit cell specific reference signals (CRSs) and/or channel
state information-reference signals (CSI-RSs) to enable a UE 115 to
estimate a DL channel. Similarly, a UE 115 may transmit sounding
reference signals (SRSs) to enable a BS 105 to estimate a UL
channel. Control information may include resource assignments and
protocol controls. Data may include protocol data and/or
operational data. In some embodiments, the BSs 105 and the UEs 115
may communicate using self-contained subframes. A self-contained
subframe may include a portion for DL communication and a portion
for UL communication. A self-contained subframe can be DL-centric
or UL-centric. A DL-centric subframe may include a longer duration
for DL communication than UL communication. A UL-centric subframe
may include a longer duration for UL communication than UL
communication.
[0039] In an embodiment, a UE 115 attempting to access the network
100 may perform an initial cell search by detecting a primary
synchronization signal (PSS) from a BS 105. The PSS may enable
synchronization of period timing and may indicate a physical layer
identity value. The UE 115 may then receive a secondary
synchronization signal (SSS). The SSS may enable radio frame
synchronization, and may provide a cell identity value, which may
be combined with the physical layer identity value to identify the
cell. The SSS may also enable detection of a duplexing mode and a
cyclic prefix length. Some systems, such as TDD systems, may
transmit an SSS but not a PSS. Both the PSS and the SSS may be
located in a central portion of a carrier, respectively.
[0040] After receiving the PSS and SSS, the UE 115 may receive a
master information block (MIB), which may be transmitted in the
physical broadcast channel (PBCH). The MIB may contain system
bandwidth information, a system frame number (SFN), and a Physical
Hybrid-ARQ Indicator Channel (PHICH) configuration. After decoding
the MIB, the UE 115 may receive one or more system information
blocks (SIBs). For example, SIB1 may contain cell access parameters
and scheduling information for other SIBs. Decoding SIB1 may enable
the UE 115 to receive SIB2. SIB2 may contain radio resource
configuration (RRC) configuration information related to random
access channel (RACH) procedures, paging, physical uplink control
channel (PUCCH), physical uplink shared channel (PUSCH), power
control, SRS, and cell barring. After obtaining the MIB and/or the
SIBs, the UE 115 can perform random access procedures to establish
a connection with the BS 105. After establishing the connection,
the UE 115 and the BS 105 can enter a normal operation stage, where
operational data may be exchanged.
[0041] In some embodiments, the UEs 115 may perform transmit power
control (TPC) instead of transmitting at a full power to allow for
multiplexing in a frequency domain, multiplexing in a spatial
domain, and/or interference management. For example, a UE 115 may
reduce the transmit power to a minimum power sufficient to maintain
a communication link 125 at a certain quality.
[0042] In an embodiment, the network 100 may operate over a shared
channel, which may include a licensed spectrum, a shared spectrum,
and/or an unlicensed spectrum, and may support dynamic medium
sharing. A BS 105 or a UE 115 may reserve a transmission
opportunity (TXOP) in a shared channel by transmitting a
reservation signal prior to transmitting data in the TXOP. Other
BSs 105 and/or other UEs 115 may listen to the channel and refrain
from accessing the channel during the TXOP upon detection of the
reservation signal. In some embodiments, the BSs 105 and/or the UEs
115 may coordinate with each other to perform interference
management for further spectrum utilization improvements.
[0043] In an embodiment, the network 100 may operate over various
frequency bands, for example, in frequency ranges between about 2
GHz to above 60 GHz. Different frequency bands may have different
PSD requirements. As described above, the ETSI document EN 301 893
V2.1.1 specifies PSD requirements for various sub-6 GHz bands. For
example, the frequency band between about 5150 MHz and about 5350
MHz may have a maximum allowable PSD level of about 10 dBm/MHz with
TPC. The frequency band between about 5250 MHz and about 5350 MHz
may have a maximum allowable PSD level of about 7 dBm/MHz without
TPC. The frequency band between about 5150 MHz and about 5250 MHz
may have a maximum allowable PSD level of about 10 dBm/MHz without
TPC. The frequency band between about 5470 MHz and about 5725 MHz
may have a maximum allowable PSD level of about 17 dBm/MHz with TPC
and a maximum allowable PSD level of about 14 dBm/MHz without TPC.
The ETSI draft document EN 302 567 V2.0.22 specifies a maximum EIRP
and an EIRP density for 60 GHz bands. For example, a 60 GHz band
may allow an EIRP density of about 13 dBm/MHz and an EIRP of about
40 dBm.
[0044] To meet a certain PSD limit in a frequency spectrum, a
transmitter (e.g., the BSs 105 and the UEs 115) may employ
frequency interlacing to spread a transmission signal over a wider
bandwidth. For example, a transmitter may transmit a signal over
multiple narrow frequency bands spaced apart from each other in a
frequency bandwidth at a higher power than transmitting the signal
over contiguous frequencies. In an embodiment, the BSs 105 and the
UEs 115 may communicate over the various frequency bands by
selecting between an interlaced frequency waveform and a
non-interlaced frequency waveform depending on the PSD requirements
in the frequency spectrums and/or the power utilization factors of
the UEs 115. Mechanisms for selecting between the interlaced
frequency waveform and the non-interlaced frequency waveform are
described in greater detail herein.
[0045] FIG. 2 is a block diagram of an exemplary UE 200 according
to embodiments of the present disclosure. The UE 200 may be a UE
115 as discussed above. As shown, the UE 200 may include a
processor 202, a memory 204, a waveform selection module 208, a
transceiver 210 including a modem subsystem 212 and a radio
frequency (RF) unit 214, and one or more antennas 216. These
elements may be in direct or indirect communication with each
other, for example via one or more buses.
[0046] The processor 202 may include a central processing unit
(CPU), a digital signal processor (DSP), an application specific
integrated circuit (ASIC), a controller, a field programmable gate
array (FPGA) device, another hardware device, a firmware device, or
any combination thereof configured to perform the operations
described herein. The processor 202 may also be implemented as a
combination of computing devices, e.g., a combination of a DSP and
a microprocessor, a plurality of microprocessors, one or more
microprocessors in conjunction with a DSP core, or any other such
configuration.
[0047] The memory 204 may include a cache memory (e.g., a cache
memory of the processor 202), random access memory (RAM),
magnetoresistive RAM (MRAM), read-only memory (ROM), programmable
read-only memory (PROM), erasable programmable read only memory
(EPROM), electrically erasable programmable read only memory
(EEPROM), flash memory, solid state memory device, hard disk
drives, other forms of volatile and non-volatile memory, or a
combination of different types of memory. In an embodiment, the
memory 204 includes a non-transitory computer-readable medium. The
memory 204 may store instructions 206. The instructions 206 may
include instructions that, when executed by the processor 202,
cause the processor 202 to perform the operations described herein
with reference to the UEs 115 in connection with embodiments of the
present disclosure. Instructions 206 may also be referred to as
code. The terms "instructions" and "code" should be interpreted
broadly to include any type of computer-readable statement(s). For
example, the terms "instructions" and "code" may refer to one or
more programs, routines, sub-routines, functions, procedures, etc.
"Instructions" and "code" may include a single computer-readable
statement or many computer-readable statements.
[0048] The waveform selection module 208 may be implemented via
hardware, software, or combinations thereof. For example, the
waveform selection module 208 may be implemented as a processor,
circuit, and/or instructions 206 stored in the memory 204 and
executed by the processor 202. The waveform selection module 208
may be used for various aspects of the present disclosure. For
example, the waveform selection module 208 is configured to select
a waveform structure between an interlaced frequency structure and
a non-interlaced frequency structure for communicating in a
frequency spectrum, receive waveform configurations from BSs such
as the BSs 105, and/or perform power ramping with or without
frequency interlacing for initial network accesses. The waveform
selection module 208 may perform the selection based on a prior
knowledge of a PSD requirement (e.g., a PSD limit or a range of
allowable PSD levels) in a frequency spectrum, a received waveform
configuration, and/or a power headroom (e.g., a power utilization
factor) of the UE 200, as described in greater detail herein.
[0049] As shown, the transceiver 210 may include the modem
subsystem 212 and the RF unit 214. The transceiver 210 can be
configured to communicate bi-directionally with other devices, such
as the BSs 105. The modem subsystem 212 may be configured to
modulate and/or encode the data from the memory 204, and/or the
waveform selection module 208 according to a modulation and coding
scheme (MCS), e.g., a low-density parity check (LDPC) coding
scheme, a turbo coding scheme, a convolutional coding scheme, a
digital beamforming scheme, etc. The RF unit 214 may be configured
to process (e.g., perform analog to digital conversion or digital
to analog conversion, etc.) modulated/encoded data from the modem
subsystem 212 (on outbound transmissions) or of transmissions
originating from another source such as a UE 115 or a BS 105. The
RF unit 214 may be further configured to perform analog beamforming
in conjunction with the digital beamforming. Although shown as
integrated together in transceiver 210, the modem subsystem 212 and
the RF unit 214 may be separate devices that are coupled together
at the UE 115 to enable the UE 115 to communicate with other
devices.
[0050] The RF unit 214 may provide the modulated and/or processed
data, e.g. data packets (or, more generally, data messages that may
contain one or more data packets and other information), to the
antennas 216 for transmission to one or more other devices. This
may include, for example, transmission of communication signals
using an interlaced frequency structure and/or a non-interlaced
frequency structure according to embodiments of the present
disclosure. The antennas 216 may further receive data messages
transmitted from other devices. The antennas 216 may provide the
received data messages for processing and/or demodulation at the
transceiver 210. The antennas 216 may include multiple antennas of
similar or different designs in order to sustain multiple
transmission links. The RF unit 214 may configure the antennas
216.
[0051] FIG. 3 is a block diagram of an exemplary BS 300 according
to embodiments of the present disclosure. The BS 300 may be a BS
105 as discussed above. A shown, the BS 300 may include a processor
302, a memory 304, a waveform selection module 308, a transceiver
310 including a modem subsystem 312 and a RF unit 314, and one or
more antennas 316. These elements may be in direct or indirect
communication with each other, for example via one or more
buses.
[0052] The processor 302 may have various features as a
specific-type processor. For example, these may include a CPU, a
DSP, an ASIC, a controller, a FPGA device, another hardware device,
a firmware device, or any combination thereof configured to perform
the operations described herein. The processor 302 may also be
implemented as a combination of computing devices, e.g., a
combination of a DSP and a microprocessor, a plurality of
microprocessors, one or more microprocessors in conjunction with a
DSP core, or any other such configuration.
[0053] The memory 304 may include a cache memory (e.g., a cache
memory of the processor 302), RAM, MRAM, ROM, PROM, EPROM, EEPROM,
flash memory, a solid state memory device, one or more hard disk
drives, memristor-based arrays, other forms of volatile and
non-volatile memory, or a combination of different types of memory.
In some embodiments, the memory 304 may include a non-transitory
computer-readable medium. The memory 304 may store instructions
306. The instructions 306 may include instructions that, when
executed by the processor 302, cause the processor 302 to perform
operations described herein. Instructions 306 may also be referred
to as code, which may be interpreted broadly to include any type of
computer-readable statement(s) as discussed above with respect to
FIG. 3.
[0054] The waveform selection module 308 may be implemented via
hardware, software, or combinations thereof. For example, the
waveform selection module 308 may be implemented as a processor,
circuit, and/or instructions 306 stored in the memory 304 and
executed by the processor 302. The waveform selection module 308
may be used for various aspects of the present disclosure. For
example, the waveform selection module 308 is configured to select
a waveform structure between an interlaced frequency structure and
a non-interlaced frequency structure for communicating in a
frequency spectrum, determine waveform configurations for different
frequency spectrums and/or different UEs such as the UEs 115,
configure resources with different waveform configurations for
initial network access, and/or transmit waveform configurations to
UEs. The waveform selection module 308 may perform the selection
and/or the determination based on a prior knowledge of a PSD
requirement (e.g., a PSD limit or a range of allowable PSD levels)
in a frequency spectrum and/or power headroom available in UEs, as
described in greater detail herein.
[0055] As shown, the transceiver 310 may include the modem
subsystem 312 and the RF unit 314. The transceiver 310 can be
configured to communicate bi-directionally with other devices, such
as the UEs 115 and/or another core network element. The modem
subsystem 312 may be configured to modulate and/or encode data
according to a MCS, e.g., a LDPC coding scheme, a turbo coding
scheme, a convolutional coding scheme, a digital beamforming
scheme, etc. The RF unit 314 may be configured to process (e.g.,
perform analog to digital conversion or digital to analog
conversion, etc.) modulated/encoded data from the modem subsystem
312 (on outbound transmissions) or of transmissions originating
from another source such as a UE 115 or 200. The RF unit 314 may be
further configured to perform analog beamforming in conjunction
with the digital beamforming. Although shown as integrated together
in transceiver 310, the modem subsystem 312 and the RF unit 314 may
be separate devices that are coupled together at the BS 105 to
enable the BS 105 to communicate with other devices.
[0056] The RF unit 314 may provide the modulated and/or processed
data, e.g. data packets (or, more generally, data messages that may
contain one or more data packets and other information), to the
antennas 316 for transmission to one or more other devices. This
may include, for example, transmission of information to complete
attachment to a network and communication with a camped UE 115 or
200 according to embodiments of the present disclosure. The
antennas 316 may further receive data messages transmitted from
other devices and provide the received data messages for processing
and/or demodulation at the transceiver 310. The antennas 316 may
include multiple antennas of similar or different designs in order
to sustain multiple transmission links.
[0057] FIGS. 4 and 5 illustrate various frequency interlacing
mechanisms for distributing a transmission or a resource allocation
over a frequency spectrum to improve power utilization. In FIGS. 4
and 5, the x-axes represent time in some constant units, and the
y-axes represent frequency in some constant units.
[0058] FIG. 4 illustrates a frequency interlacing scheme 400
according to embodiments of the present disclosure. The scheme 400
may be employed by BSs such as the BSs 105 and 300 and UEs such as
the UEs 115 and 200 to communicate over a frequency spectrum 402.
The frequency spectrum 402 may have bandwidth of about 10 megahertz
(MHz) or about 20 MHz and a SCS of about 15 kHz or about 30 kHz.
The frequency spectrum 402 may be located at any suitable
frequencies. In some embodiments, the frequency spectrum 402 may be
at about 3.5 GHz, 6 GHz, or 60 GHz. The scheme 400 allocates
resources in units of interlaces 408 at a resource block
(RB)-granularity level.
[0059] Each interlace 408 may include ten islands 406 evenly spaced
over the frequency spectrum 402. The interlaces are shown as
408.sub.I(0) to 408.sup.(M-1), where M is a positive integer
depending on various factors, as described in greater detail
herein. In an embodiment, the interlace 408.sub.I(k) may be
assigned to one UE and the interlace 408.sub.I(k+1) may be assigned
to another UE, where k may between 0 and M-2.
[0060] A group of M localized islands 406, one from each interlace
408, forms a cluster 404. As shown, the interlaces 408.sub.I(0) to
408.sub.(M-1) form ten clusters 404.sub.C(0) to 404.sub.C(9). Each
island 406 includes one RB 410. Thus, the interlaces 408 have a
granularity at an RB level. The RBs 410 are indexed from 0 to 11.
Each RB 410 may span about twelve subcarriers 412 in frequency and
a time period 414. The time period 414 may span any suitable number
of OFDM symbols. In some embodiments, the time period 414 may
include one transmission time interval (TTI), which may include
about fourteen OFDM symbols.
[0061] While the scheme 400 is illustrated with ten clusters 404,
the number of clusters may vary depending on the bandwidth of the
frequency spectrum 402, the granularity of the interlaces 408,
and/or the SCS of the subcarriers 412. In an embodiment, the
frequency spectrum 402 may have a bandwidth of about 20 megahertz
(MHz) and each subcarrier 412 may span about 15 kHz in frequency.
In such an embodiment, the frequency spectrum 402 may include about
ten interlaces 408 (e.g., M=10). For example, an allocation may
include one interlace 408 having ten distributed RBs 410. Compared
to an allocation with a single RB or ten localized RBs, the
interlaced allocation with the ten distributed RBs 410 allows a UE
to transmit at a higher power while maintaining the same PSD
level.
[0062] In another embodiment, the frequency spectrum 402 may have a
bandwidth of about 10 MHz and each subcarrier 412 may span about 15
kHz in frequency. In such an embodiment, the frequency spectrum 402
may include about five interlaces 408 (e.g., M=5). Similarly, an
allocation may include one interlace 408 having ten distributed
RBs. The interlaced allocation with the ten distributed RBs may
allow for better power utilization than an allocation with a single
RB or ten localized RBs at the same PSD level
[0063] In another embodiment, the frequency spectrum 402 may have a
bandwidth of about 20 MHz and each subcarrier 412 may span about 30
kHz in frequency. In such an embodiment, the frequency spectrum 402
may include about five interlaces 408 (e.g., M=5). Similarly, an
allocation may include one interlace 408 having ten distributed
RBs. The interlaced allocation with the ten distributed RBs may
allow for better power utilization than an allocation with a single
RB or ten localized RBs at the same PSD level.
[0064] The use of frequency interlacing for an allocation in the
frequency spectrum 402 allows a transmitter to transmit at a higher
power level than when an allocation occupies contiguous
frequencies. As an example, the frequency spectrum 402 may have a
maximum allowable PSD level of about 13 decibel-milliwatts per
megahertz (dBm/MHz) and a transmitter (e.g., the UEs 115 and 200)
may have a power amplifier (PA) capable of transmitting at about 23
dBm. Distributing frequency occupancy of an allocation with five
clusters 404 may allow the transmitter to transmit at about 20 dBm
(e.g., with a power boost of about 7 dB) while maintaining a PSD
level of about 13 dBm/MHz. Distributing frequency occupancy of an
allocation with ten clusters 404 may allow the transmitter to
transmit at a full power of about 23 dBm (e.g., with a power boost
of about 10 dB) while maintaining a PSD level of about 13 dBm/MHz.
Thus, the use of frequency interlacing for resource allocation can
provide better power utilization.
[0065] In an embodiment, the scheme 400 may be applied to a PUCCH,
a PUSCH, and a physical random access channel (PRACH) to provide a
power boost at a transmitter. For example, a UE may transmit a
random access preamble to a BS during an initial network access
over a PRACH using one interlace 408, transmit UL control
information to a BS over a PUCCH using one interlace 408, and/or
transmit UL data over a PUSCH using one interlace 408. In an
embodiment, the scheme 400 may be applied to spectrum sharing,
where a UE or a BS may transmit a medium reservation signal using
an interlaced frequency structure, for example, one interlace 408,
to improve medium sensing performance.
[0066] FIG. 5 illustrates a frequency interlacing scheme 500
according to embodiments of the present disclosure. The scheme 500
may be employed by BSs such as the BSs 105 and 300 and UEs such as
the UEs 115 and 200 to communicate over the frequency spectrum 402.
The frequency spectrum 402 may have a bandwidth of about 20 MHz and
a SCS of about 60 kHz. The scheme 500 may be substantially similar
to the scheme 400. For example, the scheme 500 may allocate
resources in units of interlaces 508, shown as 508.sub.I(0) to
508.sub.(4). However, each interlace 508 may include five islands
506 evenly spaced over the frequency spectrum 402 instead of ten
islands 406 evenly spaced over the frequency spectrum 402 as in the
scheme 400. A group of five localized islands 506, one from each
interlace 508, forms a cluster 504. As shown, the interlaces
508.sub.I(0) to 508.sub.(4) form five clusters 504.sub.C(0) to
504.sub.C(5). Each island 506 includes one RB 510. Each RB 510
spans twelve subcarriers 512 in frequency and a time period 514.
Each subcarrier 512 may span about 60 kHz in frequency. The time
period 514 may include any suitable number of OFDM symbols.
[0067] The five interlaces 508 may allow a transmitter to have a
power boost of about 7 dB. As an example, the frequency spectrum
402 may have a maximum allowable PSD level of about 10 dBm/MHz. The
distribution of an interlace allocation into five islands 506 or
five clusters 504 allows a transmitter to transmit at about 17 dBm.
To further improve power utilization, the scheme 500 may apply time
domain repetitions or TTI bundling, where an allocation may hop
from one TTI to another TTI. For example, the time period 514 may
include two TTIs (e.g., about 28 OFDM symbols) instead of one TTI
(e.g., about 14 OFDM symbols) as in the scheme 400. Such TTI
bundling may allow the transmitter to further increase the transmit
power to about 20 dBm (e.g., an increase of about 3 dB).
[0068] While the schemes 400 and 500 illustrate resource
allocations at an RB granularity level, the schemes 400 and 500 may
be alternatively configured to allocate resources at a different
granularity to achieve similar functionalities. For example, the
islands 406 or 506 can be defined in frequency units of about 4
subcarriers instead of twelve subcarriers to provide better power
utilization.
[0069] FIGS. 6 to 8 illustrate various mechanisms for selecting
between an interlaced frequency structure and a non-interlaced
frequency structure for communicating in a frequency spectrum such
as the frequency spectrum 402.
[0070] FIG. 6 illustrates a band-dependent waveform selection
scheme 600 according to embodiments of the present disclosure. The
x-axis represents frequency in some constant units. The scheme 600
may be employed by BSs such as the BSs 105 and 300 and UEs such as
the UEs 115 and 200 to determine whether to employ an interlaced
frequency structure or a non-interlaced frequency structure for
communications in a frequency spectrum based on a PSD parameter of
the frequency spectrum. The scheme 600 may employ similar
mechanisms as described in the schemes 400 and 500 with respect to
FIGS. 4 and 5, respectively, when using an interlaced frequency
structure. In the scheme 600, BSs and UEs may have prior knowledge
of PSD requirements in various frequency bands 610 and 620. The
frequency bands 610 and 620 may be located at any suitable
frequencies.
[0071] As an example, the frequency band 610 may have a PSD limit,
whereas the frequency band 620 may not have a PSD limit. To meet
the PSD limit in the frequency band 610, a BS may communicate with
a UE in the frequency band 610 using an interlaced frequency
structure (e.g., an interlace 408.sub.I(k) or 508.sub.I(k)). Since
the frequency band 620 does not have a PSD limit, a BS may
communicate with a UE in the frequency band 620 using a
non-interlaced frequency structure (e.g., including contiguous
frequencies).
[0072] FIG. 7 is a signaling diagram of a network-specific waveform
selection method 700 according to embodiments of the present
disclosure. The method 700 is implemented among a BS, a UE A, and a
UE B. The BS may be similar to the BSs 105 and 300. The UEs A and B
may be similar to the UEs 115 and 200. Steps of the method 700 can
be executed by computing devices (e.g., a processor, processing
circuit, and/or other suitable component) of the BS and the UEs A
and B. As illustrated, the method 700 includes a number of
enumerated steps, but embodiments of the method 700 may include
additional steps before, after, and in between the enumerated
steps. In some embodiments, one or more of the enumerated steps may
be omitted or performed in a different order.
[0073] At step 710, the BS transmits a configuration indicating
waveform structures for various frequency bands (e.g., the
frequency bands 610 and 620). For example, the configuration may
indicate an interlaced frequency structure (e.g., an interlace
408.sub.I(k) or 508.sub.I(k)) for a frequency band with a PSD limit
and may indicate a non-interlaced frequency structure (e.g.,
including contiguous frequencies) for a frequency band without a
PSD limit. In an embodiment, the BS may broadcast the configuration
in a SIB to all UEs (e.g., including the UEs A and B) in a network
(e.g., the network 100).
[0074] At step 720, the BS may communicate with the UE A and the UE
B according to the configuration. The UE A or the UE B may
determine whether to use an interlaced frequency structure or a
non-interlaced frequency structure for communicating with the BS
based on the waveform structures indicated in the received
configuration. When the waveform structure for a frequency band
indicates an interlaced frequency structure, the BS and the UE may
communicate with each other using similar mechanisms as in the
scheme 400 or 500.
[0075] FIG. 8 is a signaling diagram of a UE-specific waveform
selection method 800 according to embodiments of the present
disclosure. The method 800 is implemented among a BS, a UE A, and a
UE B. The BS may be similar to the BSs 105 and 300. The UEs A and B
may be similar to the UEs 115 and 200. Steps of the method 800 can
be executed by computing devices (e.g., a processor, processing
circuit, and/or other suitable component) of the BS and the UEs A
and B. As illustrated, the method 800 includes a number of
enumerated steps, but embodiments of the method 800 may include
additional steps before, after, and in between the enumerated
steps. In some embodiments, one or more of the enumerated steps may
be omitted or performed in a different order.
[0076] The method 800 may configure or assign transmissions per UE
with an interlaced frequency structure or a non-interlaced
frequency structure based on power headroom reports received from
the UEs. For example, when a UE is power-limited, the BS may
schedule a transmission (e.g., a PUSCH transmission) for the UE
with an interlaced frequency structure. A UE is power-limited when
the required transmit power for a UL transmission in a particular
communication channel or link exceeds an available transmit power
of the UE. Alternatively, when a UE is not power-limited, the BS
may schedule a transmission for the UE with a non-interlaced
frequency structure.
[0077] At step 810, the BS transmits a configuration A indicating a
waveform structure for the UE A. For example, the UE A is
power-limited, and thus the waveform structure may indicate an
interlaced frequency structure (e.g., an interlace 408.sub.I(k) or
508.sub.I(k)).
[0078] At step 820, the BS transmits a configuration B indicating a
waveform structure for the UE B. For example, the UE B is not
power-limited, and thus the waveform structure may indicate a
non-interlaced frequency structure (e.g., including contiguous
frequencies).
[0079] At step 830, the BS may communicate with the UE A based on
the configuration A, for example, using the interlaced frequency
structure.
[0080] At step 840, the BS may communicate with the UE B based on
the configuration B, for example, using the non-interlaced
frequency structure.
[0081] In an embodiment, the BS may select an interlaced frequency
structure or a non-interlaced frequency structure for a UE based on
a power headroom of the UE and a PSD parameter (e.g., a PSD limit
or a range of allowable PSD levels) of a frequency band. For
example, the BS may schedule the UE A with an interlaced frequency
structure in one frequency band and a non-interlaced frequency
structure in another frequency band. Alternatively, the BS may
schedule the UE A with an interlaced frequency structure in one
time period and a non-interlaced frequency structure in another
time period.
[0082] FIGS. 9 and 10 illustrate various mechanisms for configuring
random access resources with an interlaced frequency structure and
a non-interlaced frequency structure.
[0083] FIG. 9 illustrates a random access transmission scheme 900
according to embodiments of the present disclosure. The x-axis
represents frequency in some constant units. The scheme 900 may be
employed by BSs such as the BSs 105 and 300 and UEs such as the UEs
115 and 200. In the scheme 900, a BS may configure multiple sets of
random access resources in different frequency bands. For example,
one set of random access resources 910 may be located in a
frequency band 902 and may have an interlaced frequency structure
(e.g., an interlace 408.sub.I(k) or 508.sub.I(k)). Another set of
random access resources 920 may be located in a frequency band 904
and may have a non-interlaced frequency structure (e.g., including
contiguous frequencies). A UE may autonomously select resources
from the resources 910 in the frequency band 902 or from the
resources 920 in the frequency band 904 for transmitting a random
access signal. The BS may monitor for a random access signal in the
resources 910 based on the interlaced frequency structure and in
the resources 920 based on the non-interlaced frequency
structure.
[0084] In an embodiment, the selection may be based on a DL path
loss measurement. When a UE is power-limited, the UE may select
resources from the resources 910 with the interlaced frequency
structure for better power utilization. For example, the UE may
transmit a random access preamble in a frequency interlaced channel
similar to the interlaces 408 and 508. Conversely, when a UE is not
power-limited, the UE may select resources from the resources 920
with the non-interlaced frequency structure. For example, the UE
may transmit a random access preamble in contiguous
frequencies.
[0085] In an embodiment, a UE may perform power ramping during a
random access procedure. For example, at the beginning of a random
access procedure, the UE may select a resource from the resources
920 with the non-interlaced frequency structure for a random access
preamble transmission. When no random access response is received,
the UE may increase the transmit power for a subsequent random
access transmission. When the transmit power reaches a maximum PSD
level allowable in the frequency band 904, the UE may switch to
select a resource from the resources 910 with the interlaced
frequency structure for a subsequent random access preamble
transmission.
[0086] FIG. 10 illustrates a random access transmission scheme 1000
according to embodiments of the present disclosure. The x-axis
represents time in some constant units. The y-axis represents
frequency in some constant units. The scheme 1000 may be employed
by BSs such as the BSs 105 and 300 and UEs such as the UEs 115 and
200. The scheme 1000 may be substantially similar to the scheme
900. However, a BS may configure multiple sets of random access
resources in different time periods instead of different frequency
bands as in the scheme 900. For example, one set of random access
resources 1010 may be located in a time period 1002 and may have an
interlaced frequency structure (e.g., an interlace 408.sub.I(k) or
508.sub.I(k)). Another set of random access resources 1020 may be
located in a time period 1004 and may have a non-interlaced
frequency structure (e.g., including contiguous frequencies). In an
embodiment, resources 1010 and 1020 are located in the same
frequency band 1001.
[0087] Similar to the scheme 900, a UE may autonomously select
resources from the resources 1010 in the time period 1002 or from
the resources 1020 in the time period 1004 for transmitting a
random access signal. The selection may be based on a DL path loss
measurement, a power utilization factor (e.g., a power headroom) of
the UE, and/or a transmit power used for the random access preamble
transmission as described in the scheme 900. The BS may monitor for
a random access signal in the resources 1010 based on the
interlaced frequency structure and in the resources 1020 based on
the non-interlaced frequency structure.
[0088] FIG. 11 illustrates a frequency interlacing scheme 1100 with
a reduced SCS according to embodiments of the present disclosure.
The scheme 1100 may be employed by BSs such as the BSs 105 and 300
and UEs such as the UEs 115 and 200 to communicate over a frequency
spectrum 402. The scheme 1100 may be substantially similar to the
schemes 400 and 500, but may allocate resources at a reduced
SCS.
[0089] The frequency spectrum 402 may have a bandwidth of about 20
MHz and a SCS of about 60 kHz. Thus, the frequency spectrum 402
includes twenty-five RBs 510 (e.g., indexed from 0 to 24). As
described above with respect to FIG. 5, when allocating resources
in units of interlaces 508 at an RB-granularity level, the scheme
500 may provide a power boost of about 7 dB without the TTI
bundling. Instead of further improving power utilization using TTI
bundling, the scheme 1100 applies frequency interlacing at a
reduced SCS.
[0090] The scheme 1100 divides each subcarrier 512 into about four
subcarriers 1112. Thus, each subcarrier 1112 spans about 15 kHz.
For example, the subcarrier 512 indexed 0 is divided into four
subcarriers 1112 indexed 0 to 3, the subcarrier 512 indexed 1 is
divided into four subcarriers 1112 indexed 4 to 7, and the
subcarrier 512 indexed 2 is divided into four subcarriers 1112
indexed 8 to 11. The group of 12 subcarriers 1112 forms a RB
1110.
[0091] Similar to the schemes 400 and 500, the scheme 1100 may
allocate resources in units of interlaces similar to the interlaces
408 and 508. For example, each interlace may include about ten
islands 1106 evenly spaced over the spectrum 402, where each island
1106 includes one RB 1110. Thus, the frequency spectrum may include
about ten interlaces. The distribution of an allocation's frequency
occupancy into ten islands 1106 can provide a power boost of about
10 dB. Alternatively, the scheme 1100 may divide each subcarrier
512 into about two subcarriers, each spanning about 30 kHz. The
reduced SCS can distribute an allocation in a frequency domain to
allow a transmitter to transmit at a higher power while maintaining
a certain PSD level.
[0092] In an embodiment, the reduced SCS can increase computational
complexity. For example, under normal operation with a bandwidth of
20 MHz and a SCS of about 60 kHz, a 512-point Fast Fourier
transform (FFT) may be applied. However, reducing the SCS to about
15 kHz, a 2048-point FFT may be required. The larger FFT-size may
increase the computational complexity. One approach to reducing the
computational complexity is to segment the 20 MHz bandwidth into
about four segments and apply four 512-point FFTs, one for each
segment.
[0093] In an embodiment, communications in a frequency spectrum
below about 6 GHz may use an interlaced frequency waveform
structure and communications in a frequency spectrum above about 6
GHz may use an interlaced frequency waveform structure and a
non-interlaced frequency waveform structure. For example, the
schemes 400, 500, and 1100 described with respect to 4, 5, and 11,
respectively, may be used for the interlaced frequency-based
communications. The schemes 600, 900, and 1000 and the methods 700
and 800 described with respect to FIGS. 6, 9, 10, 7, and 8,
respectively, may be used to select between the interlaced
frequency waveform structure and the non-interlaced frequency
waveform structure for communications above 6 GHz.
[0094] FIG. 12 is a flow diagram of a communication method 1200
with a waveform selection according to embodiments of the present
disclosure. Steps of the method 1200 can be executed by a computing
device (e.g., a processor, processing circuit, and/or other
suitable component) of a wireless communication device, such as the
BSs 105 and 300 and the UEs 115 and 200. The method 1200 may employ
similar mechanisms as in the schemes 400, 500, 600, 900, and 1000
and the methods 700 and 800 described with respect to FIGS. 4, 5,
6, 9, 10, 7, and 8, respectively. As illustrated, the method 1200
includes a number of enumerated steps, but embodiments of the
method 1200 may include additional steps before, after, and in
between the enumerated steps. In some embodiments, one or more of
the enumerated steps may be omitted or performed in a different
order.
[0095] At step 1210, the method 1200 includes selecting, by a first
wireless communication device, a waveform structure between an
interlaced frequency structure and a non-interlaced frequency
structure for communicating in a frequency spectrum (e.g., the
frequency spectrum 402). The interlaced frequency structure may
include at least a first set of frequency bands (e.g., the
interlace 408.sub.I(0) or 508.sub.I(0)) in the spectrum. The first
set of frequency bands interlaces with a second set of frequency
bands (e.g., the interlace 408.sub.I(1) or 508.sub.I(1)) in the
frequency spectrum. The non-interlaced frequency structure may
include one or more contiguous frequency bands, RBs, or in the
frequency spectrum. The selection may be band-dependent as
described in the scheme 600, network-specific as described in the
method 700, or UE-specific as described in the method 800.
[0096] At step 1220, the method 1200 includes communicating, by the
first wireless communication device with a second wireless
communication device, a communication signal in the frequency
spectrum based on the selected waveform structure.
[0097] Information and signals may be represented using any of a
variety of different technologies and techniques. For example,
data, instructions, commands, information, signals, bits, symbols,
and chips that may be referenced throughout the above description
may be represented by voltages, currents, electromagnetic waves,
magnetic fields or particles, optical fields or particles, or any
combination thereof.
[0098] The various illustrative blocks and modules described in
connection with the disclosure herein may be implemented or
performed with a general-purpose processor, a DSP, an ASIC, an FPGA
or other programmable logic device, discrete gate or transistor
logic, discrete hardware components, or any combination thereof
designed to perform the functions described herein. A
general-purpose processor may be a microprocessor, but in the
alternative, the processor may be any conventional processor,
controller, microcontroller, or state machine. A processor may also
be implemented as a combination of computing devices (e.g., a
combination of a DSP and a microprocessor, multiple
microprocessors, one or more microprocessors in conjunction with a
DSP core, or any other such configuration).
[0099] The functions described herein may be implemented in
hardware, software executed by a processor, firmware, or any
combination thereof. If implemented in software executed by a
processor, the functions may be stored on or transmitted over as
one or more instructions or code on a computer-readable medium.
Other examples and implementations are within the scope of the
disclosure and appended claims. For example, due to the nature of
software, functions described above can be implemented using
software executed by a processor, hardware, firmware, hardwiring,
or combinations of any of these. Features implementing functions
may also be physically located at various positions, including
being distributed such that portions of functions are implemented
at different physical locations. Also, as used herein, including in
the claims, "or" as used in a list of items (for example, a list of
items prefaced by a phrase such as "at least one of" or "one or
more of") indicates an inclusive list such that, for example, a
list of [at least one of A, B, or C] means A or B or C or AB or AC
or BC or ABC (i.e., A and B and C).
[0100] Further embodiments of the present disclosure include a
method of wireless communication comprising selecting, by a first
wireless communication device, a waveform structure between an
interlaced frequency structure and a non-interlaced frequency
structure for communicating in a frequency spectrum; and
communicating, by the first wireless communication device with a
second wireless communication device in the frequency spectrum, a
communication signal based on the selected waveform structure.
[0101] In some embodiments, wherein the interlaced frequency
structure includes at least a first set of frequency bands in the
frequency spectrum, the first set of frequency bands interlacing
with a second set of frequency bands in the frequency spectrum, and
wherein the non-interlaced frequency structure includes one or more
contiguous frequency bands in the frequency spectrum. In some
embodiments, wherein the selecting is based on a power spectral
density (PSD) parameter of the frequency spectrum. In some
embodiments, wherein the PSD parameter is associated with a PSD
requirement in the frequency spectrum, and wherein the selecting
includes determining whether the frequency spectrum has the PSD
requirement; and selecting the interlaced frequency structure as
the waveform structure when determining that the frequency spectrum
has the PSD requirement. In some embodiments, wherein the PSD
parameter is associated with a PSD requirement in the frequency
spectrum, wherein the selecting is based on a first frequency band
having the PSD requirement and a second frequency band not having
the PSD requirement, and wherein the communicating includes
communicating a first communication signal with the interlaced
frequency structure in the first frequency band; and communicating
a second communication signal with the non-interlaced frequency
structure in the second frequency band. In some embodiments, the
method further comprises transmitting, by the first wireless
communication device, a configuration indicating the waveform
structure for communicating in the frequency spectrum. In some
embodiments, wherein the selecting is based on a power headroom of
the second wireless communication device. In some embodiments, the
method further comprises receiving, by the first wireless
communication device from the second wireless communication device,
a configuration indicating the waveform structure for communicating
in the frequency spectrum, wherein the selecting is based on the
configuration. In some embodiments, the method further comprises
communicating, by the first wireless communication device with the
second wireless communication device, a configuration indicating a
first set of random access resources having a interlaced frequency
structure and a second set of random access resources having a
non-interlaced frequency structure; and communicating, by the first
wireless communication device with the second wireless
communication device, a random access signal based on the
configuration. In some embodiments, wherein the first set of random
access resources and the second set of random access resources are
in different frequency bands within the frequency spectrum. In some
embodiments, wherein the first set of random access resources and
the second set of random access resources are in different time
periods. In some embodiments, wherein the communicating the
configuration includes transmitting, by the first wireless
communication device to the second wireless communication device,
the configuration, and wherein the communicating the random access
signal includes monitoring, by the first wireless communication
device, for the random access signal. In some embodiments, wherein
the communicating the configuration includes receiving, by the
first wireless communication device from the second wireless
communication device, the configuration. In some embodiments, the
method further comprises determining, by the first wireless
communication device, whether to transmit the random access signal
to the second wireless communication device using the first set of
random access resources or the second set of random access
resources based on at least one of the configuration, a power
headroom of the second wireless communication device, or a power
utilization factor of the second wireless communication device. In
some embodiments, wherein the communicating the random access
signal includes transmitting, by the first wireless communication
device to the second wireless communication device using the second
set of random access resources, a first random access signal with
the non-interlaced frequency structure at a first transmit power;
and transmitting, by the first wireless communication device to the
second wireless communication device using the first set of random
access resources, a second random access signal with the interlaced
frequency structure at a second transmit power greater than the
first transmit power. In some embodiments, the method further
comprises determining, by the first wireless communication device,
to transmit the second random access signal with the interlaced
frequency structure using the first set of random access resources
based on a comparison between the second transmit power and a power
spectral density (PSD) parameter of a frequency band of the second
set of random access resources. In some embodiments, wherein the
frequency spectrum includes a first subcarrier spacing for the
non-interlaced frequency structure, wherein the communicating the
communication signal includes communicating the communication
signal using a second subcarrier spacing for the interlaced
frequency structure, and wherein the first subcarrier spacing is
greater than the second subcarrier spacing.
[0102] Further embodiments of the present disclosure include an
apparatus comprising a processor configured to select a waveform
structure between an interlaced frequency structure and a
non-interlaced frequency structure for communicating in a frequency
spectrum; and a transceiver configured to communicate, with a
second wireless communication device in the frequency spectrum, a
communication signal based on the selected waveform structure.
[0103] In some embodiments, wherein the interlaced frequency
structure includes at least a first set of frequency bands in the
frequency spectrum, the first set of frequency bands interlacing
with a second set of frequency bands in the frequency spectrum, and
wherein the non-interlaced frequency structure includes one or more
contiguous frequency bands in the frequency spectrum. In some
embodiments, wherein the processor is further configured to select
the waveform structure based on a power spectral density (PSD)
parameter of the frequency spectrum. In some embodiments, wherein
the PSD parameter is associated with a PSD requirement in the
frequency spectrum, and wherein the processor is further configured
to select the waveform structure by determining whether the
frequency spectrum has a PSD requirement; and selecting the
interlaced frequency structure as the waveform structure when
determining that the frequency spectrum has the PSD requirement. In
some embodiments, wherein the PSD parameter is associated with a
PSD requirement in the frequency spectrum, wherein the processor is
further configured to select the waveform structure based on a
first frequency band having the PSD requirement and a second
frequency band not having the PSD requirement, and wherein the
transceiver is further configured to communicate a first
communication signal with the interlaced frequency structure in the
first frequency band; and communicate a second communication signal
with the non-interlaced frequency structure in the second frequency
band. In some embodiments, wherein the transceiver is further
configured to transmit a configuration indicating the waveform
structure for communicating in the frequency spectrum. In some
embodiments, wherein the processor is further configured to select
the waveform structure based on a power headroom of the second
wireless communication device. In some embodiments, wherein the
transceiver is further configured to receive, from the second
wireless communication device, a configuration indicating the
waveform structure for communicating in the frequency spectrum, and
wherein the processor is further configured to select the waveform
structure based on the configuration. In some embodiments, wherein
the transceiver is further configured to communicate, with the
second wireless communication device, a configuration indicating a
first set of random access resources having an interlaced frequency
structure and a second set of random access resources having a
non-interlaced frequency structure; and communicate, with the
second wireless communication device, a random access signal based
on the configuration. In some embodiments, wherein the first set of
random access resources and the second set of random access
resources are in different frequency bands within the frequency
spectrum. In some embodiments, wherein the first set of random
access resources and the second set of random access resources are
in different time periods. In some embodiments, wherein the
transceiver is further configured to communicate the configuration
by transmitting, to the second wireless communication device, the
configuration; and communicate the random access signal by
monitoring for the random access signal. In some embodiments,
wherein the transceiver is further configured to communicate the
configuration by receiving, from the second wireless communication
device, the configuration. In some embodiments, wherein the
processor is further configured to determine whether to transmit
the random access signal to the second wireless communication
device using the first set of random access resources or the second
set of random access resources based on at least one of the
configuration, a power headroom of the second wireless
communication device, or a power utilization factor of the second
wireless communication device. In some embodiments, wherein the
transceiver is further configured to communicate the random access
signal by transmitting, to the second wireless communication device
using the second set of random access resources, a first random
access signal with the non-interlaced frequency structure at a
first transmit power; and transmitting, to the second wireless
communication device using the first set of random access
resources, a second random access signal with the interlaced
frequency structure at a second transmit power greater than the
first transmit power. In some embodiments, wherein the processor is
further configured to determine to transmit the second random
access signal with the interlaced frequency structure using the
first set of random access resources based on a comparison between
the second transmit power and a power spectral density (PSD)
parameter of a frequency band of the second set of random access
resources. In some embodiments, wherein the frequency spectrum
includes a first SCS for the non-interlaced frequency structure,
wherein the transceiver is further configured to communicate the
communication signal by communicating the communication signal
using a second SCS for the interlaced frequency structure, and
wherein the first SCS is greater than the second SCS.
[0104] Further embodiments of the present disclosure include a
computer-readable medium having program code recorded thereon, the
program code comprising code for causing a first wireless
communication device to select a waveform structure between an
interlaced frequency structure and a non-interlaced frequency
structure for communicating in a frequency spectrum; and code for
causing the first wireless communication device to communicate,
with a second wireless communication device in the frequency
spectrum, a communication signal based on the selected waveform
structure.
[0105] In some embodiments, wherein the interlaced frequency
structure includes at least a first set of frequency bands in the
frequency spectrum, the first set of frequency bands interlacing
with a second set of frequency bands in the frequency spectrum, and
wherein the non-interlaced frequency structure includes one or more
contiguous frequency bands in the frequency spectrum. In some
embodiments, wherein the code for causing the first wireless
communication device to select the waveform structure is further
configured to select the waveform structure based on a power
spectral density (PSD) parameter of the frequency spectrum. In some
embodiments, wherein the PSD parameter is associated with a PSD
requirement in the frequency spectrum, and wherein the code for
causing the first wireless communication device to select the
waveform structure is further configured to select the waveform
structure by determining whether the frequency spectrum has the PSD
requirement; and selecting the interlaced frequency structure as
the waveform structure when determining that the frequency spectrum
has the PSD requirement. In some embodiments, wherein the PSD
parameter is associated with a PSD requirement in the frequency
spectrum, wherein the code for causing the first wireless
communication device to select the waveform structure is further
configured to select the waveform structure based on a first
frequency band having the PSD requirement and a second frequency
band not having the PSD requirement, and wherein the code for
causing the first wireless communication device to communicate the
communication signal is further configured to communicate the
communicate signal by communicating a first communication signal
with the interlaced frequency structure in the first frequency
band; and communicating a second communication signal with the
non-interlaced frequency structure in the second frequency band. In
some embodiments, the computer-readable medium further comprises
code for causing the first wireless communication device to
transmit a configuration indicating the waveform structure for
communicating in the frequency spectrum. In some embodiments,
wherein the code for causing the first wireless communication
device to select the waveform structure is further configured to
select the waveform structure based on a power headroom of the
second wireless communication device. In some embodiments, the
computer-readable medium further comprises code for causing the
first wireless communication device to receive, from the second
wireless communication device, a configuration indicating the
waveform structure for communicating in the frequency spectrum,
wherein the code for causing the first wireless communication
device to select the waveform structure is further configured to
select the waveform structure based on the configuration. In some
embodiments, the computer-readable medium further comprises code
for causing the first wireless communication device to communicate,
with the second wireless communication device, a configuration
indicating a first set of random access resources having an
interlaced frequency structure and a second set of random access
resources having a non-interlaced frequency structure; and code for
causing the first wireless communication device to communicate,
with the second wireless communication device, a random access
signal based on the configuration. In some embodiments, wherein the
first set of random access resources and the second set of random
access resources are in different frequency bands within the
frequency spectrum. In some embodiments, wherein the first set of
random access resources and the second set of random access
resources are in different time periods. In some embodiments,
wherein the code for causing the first wireless communication
device to communicate the configuration is further configured to
transmit, to the second wireless communication device, the
configuration, and wherein the code for causing the first wireless
communication device to communicate the random access signal is
further configured to monitor for the random access signal. In some
embodiments, wherein the code for causing the first wireless
communication device to communicate the configuration is further
configured to receive, from the second wireless communication
device, the configuration. In some embodiments, the
computer-readable medium further comprises code for causing the
first wireless communication device to determine whether to
transmit the random access signal to the second wireless
communication device using the first set of random access resources
or the second set of random access resources based on at least one
of the configuration, a power headroom of the second wireless
communication device, or a power utilization factor of the second
wireless communication device. In some embodiments, wherein the
code for causing the first wireless communication device to
communicate the random access signal is further configured to
transmit, to the second wireless communication device using the
second set of random access resources, a first random access signal
with the non-interlaced frequency structure at a first transmit
power; and transmit, to the second wireless communication device
using the first set of random access resources, a second random
access signal with the interlaced frequency structure at a second
transmit power greater than the first transmit power. In some
embodiments, the computer-readable medium further comprises code
for causing the first wireless communication device to determine to
transmit the second random access signal with the interlaced
frequency structure using the first set of random access resources
based on a comparison between the second transmit power and a power
spectral density (PSD) parameter of a frequency band of the second
set of random access resources. In some embodiments, wherein the
frequency spectrum includes a first SCS for the non-interlaced
frequency structure, wherein the code for causing the first
wireless communication device to communicate the communication
signal is further configured to communicate the communication
signal using a second SCS for the interlaced frequency structure,
and wherein the first SCS is greater than the second SCS.
[0106] Further embodiments of the present disclosure include an
apparatus comprising means for selecting a waveform structure
between an interlaced frequency structure and a non-interlaced
frequency structure for communicating in a frequency spectrum; and
means for communicating, with a second wireless communication
device in the frequency spectrum, a communication signal based on
the selected waveform structure.
[0107] In some embodiments, wherein the interlaced frequency
structure includes at least a first set of frequency bands in the
frequency spectrum, the first set of frequency bands interlacing
with a second set of frequency bands in the frequency spectrum, and
wherein the non-interlaced frequency structure includes one or more
contiguous frequency bands in the frequency spectrum. In some
embodiments, wherein the means for selecting the waveform structure
is further configured to select the waveform structure based on a
power spectral density (PSD) parameter of the frequency spectrum.
In some embodiments, wherein the PSD parameter is associated with a
PSD requirement in the frequency spectrum, and wherein the means
for selecting the waveform structure is further configured to
select the waveform structure by determining whether the frequency
spectrum has the PSD requirement; and selecting the interlaced
frequency structure as the waveform structure when determining that
the frequency spectrum has the PSD requirement. In some
embodiments, wherein the PSD parameter is associated with a PSD
requirement in the frequency spectrum, wherein the means for
selecting the waveform structure is further configured to select
the waveform structure based on a first frequency band having the
PSD requirement and a second frequency band not having the PSD
requirement, and wherein the means for communicating the
communication signal is further configured to communicate a first
communication signal with the interlaced frequency structure in the
first frequency band; and communicate a second communication signal
with the non-interlaced frequency structure in the second frequency
band. In some embodiments, the apparatus further comprises means
for transmitting a configuration indicating the waveform structure
for communicating in the frequency spectrum. In some embodiments,
wherein the means for selecting the waveform structure is further
configured to select the waveform structure based on a power
headroom of the second wireless communication device. In some
embodiments, the apparatus further comprises means for receiving,
from the second wireless communication device, a configuration
indicating the waveform structure for communicating in the
frequency spectrum, wherein the means for selecting the waveform
structure is further configured to select the waveform structure
based on the configuration. In some embodiments, the apparatus
further comprises means for communicating, with the second wireless
communication device, a configuration indicating a first set of
random access resources having an interlaced frequency structure
and a second set of random access resources having a non-interlaced
frequency structure; and means for communicating, with the second
wireless communication device, a random access signal based on the
configuration. In some embodiments, wherein the first set of random
access resources and the second set of random access resources are
in different frequency bands within the frequency spectrum. In some
embodiments, wherein the first set of random access resources and
the second set of random access resources are in different time
periods. In some embodiments, wherein the means for communicating
the configuration is further configured to transmit, to the second
wireless communication device, the configuration, and wherein the
means for communicating the random access signal is further
configured to monitor for the random access signal. In some
embodiments, wherein the means for communicating the configuration
is further configured to receive, from the second wireless
communication device, the configuration. In some embodiments, the
apparatus further comprises means for determining whether to
transmit the random access signal to the second wireless
communication device using the first set of random access resources
or the second set of random access resources based on at least one
of the configuration, a power headroom of the second wireless
communication device, or a power utilization factor of the second
wireless communication device. In some embodiments, wherein the
means for communicating the random access signal is further
configured to transmit, to the second wireless communication device
using the second set of random access resources, a first random
access signal with the non-interlaced frequency structure at a
first transmit power; and transmit, to the second wireless
communication device using the first set of random access
resources, a second random access signal with the interlaced
frequency structure at a second transmit power greater than the
first transmit power. In some embodiments, the apparatus further
comprises means for determining to transmit the second random
access signal with the interlaced frequency structure using the
first set of random access resources based on a comparison between
the second transmit power and a power spectral density (PSD)
parameter of a frequency band of the second set of random access
resources. In some embodiments, wherein the frequency spectrum
includes a first SCS for the non-interlaced frequency structure,
wherein the means for communicating the communication signal is
further configured to communicate the communication signal using a
second SCS for the interlaced frequency structure, and wherein the
first SCS is greater than the second SCS.
[0108] As those of some skill in this art will by now appreciate
and depending on the particular application at hand, many
modifications, substitutions and variations can be made in and to
the materials, apparatus, configurations and methods of use of the
devices of the present disclosure without departing from the spirit
and scope thereof. In light of this, the scope of the present
disclosure should not be limited to that of the particular
embodiments illustrated and described herein, as they are merely by
way of some examples thereof, but rather, should be fully
commensurate with that of the claims appended hereafter and their
functional equivalents.
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